Refrigerator shelf



FIG. 1 is a front elevational view of a refrigerator shelf, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top, front, right perspective view thereof; and,

FIG. 7 is a bottom, rear, left perspective view thereof. 

The ornamental design for a refrigerator shelf, as shown and described. 